The Impractical Joker is the thirteenth episode of Season 2 of The Brady Bunch, and the 38th overall episode of the series. Written by Burt Styler and directed by Oscar Rudolph, it first aired 1 January 1971 on ABC.
Jan starts playing practical jokes, one of which results in the escape of Greg's science project mouse, Myron.
Jan has been the perpetrator of a series of practical jokes in the house. Everyone is getting tired of it except Jan. When Greg brings home a mouse named Myron as a science project, the household is mixed about whether they even want a mouse in the house, with all the females, excluding Jan (and Alice, who doesn't know since she is away), not wanting Myron around. The resulting compromise is that Greg can keep Myron out in the garage.
In the middle of the night, Greg realizes that the neighbor's cat may get to Myron, so he decides to bring Myron into his bedroom with Peter and Bobby's knowledge. What Greg doesn't realize is that Jan also knows he brought Myron into the house. She thinks it would be funny if she took Myron and hid him on Greg. Two problems arise: Myron gets out of the hiding spot, and Alice, who has since returned and sees a mouse running around the house, calls in the exterminator. Will Myron survive the ordeal, and will his possible extermination make Jan reconsider her practical joking ways?
- This episode sparked an argument between Robert Reed and Sherwood Schwartz over Mike's dialogue with the mouse.